Optical illusions are a kind of joke, our brain makes us believe what we see when in reality it shows us other things. This is the case with stereograms, which can easily fool us by hiding 3D graphics in flat, invisible images.

To surprise you, we want to test you by showing you how the optical illusion created by the stereogram works. Therefore, we have prepared 18 images for you to train your eyes and quickly find hidden shapes!

So let’s start. 1. Ready to start? Find the hidden lion.

2. And here there’s a naughty monkey hiding.

To be able to see the 3D images of the stereograms, you don’t need 3D glasses, but you do need a lot of ingenuity and patience, and the results are worth it! If you can’t see them with the naked eye, there are a few methods you can use to make sure you can still find them:

The important thing is to de-focus your view of the image so that you can see it from each eye’s single perspective at the same time.
You can focus on the center of the image and slowly move closer to it until the image starts making sense.

3. Can you see the rabbit?

Stand 30 centimeters away from the image and relax your eyes until your vision becomes blurred and sort of doubled. This will make your eyes wander off at different angles. You will soon find one in which the hidden image will gradually appear. Keep staring at the image until it takes on a clear shape.

4. There’s a bear hiding here.

Many people, no matter how hard they practice these exercises, cannot see these images. This can happen if you have problems with your binocular vision. As we have pointed out before, in order to see the binocular image,

both eyes must see the same image at the same time. Those who have strabismus, a lazy eye, or any similar condition might not be able to see them since the brain processes images using a different concept of depth.